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| author | Dave Martin <Dave.Martin@arm.com> | 2019-06-03 17:35:02 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2019-06-05 14:05:28 +0200 |
| commit | 78ed70bf3a923f1965e3c19f544677d418397108 (patch) | |
| tree | eea8210beec14f5d0c85f793af4fea631ff4d74d /fs/compat_ioctl.c | |
| parent | arm64: use the correct function type for __arm64_sys_ni_syscall (diff) | |
| download | linux-78ed70bf3a923f1965e3c19f544677d418397108.tar.xz linux-78ed70bf3a923f1965e3c19f544677d418397108.zip | |
arm64: cpufeature: Fix missing ZFR0 in __read_sysreg_by_encoding()
In commit 06a916feca2b ("arm64: Expose SVE2 features for
userspace"), new hwcaps are added that are detected via fields in
the SVE-specific ID register ID_AA64ZFR0_EL1.
In order to check compatibility of secondary cpus with the hwcaps
established at boot, the cpufeatures code uses
__read_sysreg_by_encoding() to read this ID register based on the
sys_reg field of the arm64_elf_hwcaps[] table.
This leads to a kernel splat if an hwcap uses an ID register that
__read_sysreg_by_encoding() doesn't explicitly handle, as now
happens when exercising cpu hotplug on an SVE2-capable platform.
So fix it by adding the required case in there.
Fixes: 06a916feca2b ("arm64: Expose SVE2 features for userspace")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'fs/compat_ioctl.c')
0 files changed, 0 insertions, 0 deletions